WO2006111759A1 - Pyrrolobenzodiazepines - Google Patents
Pyrrolobenzodiazepines Download PDFInfo
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- WO2006111759A1 WO2006111759A1 PCT/GB2006/001456 GB2006001456W WO2006111759A1 WO 2006111759 A1 WO2006111759 A1 WO 2006111759A1 GB 2006001456 W GB2006001456 W GB 2006001456W WO 2006111759 A1 WO2006111759 A1 WO 2006111759A1
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- YUOCYTRGANSSRY-UHFFFAOYSA-N pyrrolo[2,3-i][1,2]benzodiazepine Chemical class C1=CN=NC2=C3C=CN=C3C=CC2=C1 YUOCYTRGANSSRY-UHFFFAOYSA-N 0.000 title description 8
- 125000003118 aryl group Chemical group 0.000 claims abstract description 72
- 150000001875 compounds Chemical class 0.000 claims abstract description 69
- 125000000623 heterocyclic group Chemical group 0.000 claims abstract description 47
- 125000002947 alkylene group Chemical group 0.000 claims abstract description 18
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 claims abstract description 14
- 150000001768 cations Chemical class 0.000 claims abstract description 12
- 239000012453 solvate Substances 0.000 claims abstract description 12
- 125000005843 halogen group Chemical group 0.000 claims abstract description 11
- 125000005842 heteroatom Chemical group 0.000 claims abstract description 8
- 125000004400 (C1-C12) alkyl group Chemical group 0.000 claims abstract description 5
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 4
- 125000000217 alkyl group Chemical group 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 27
- 229920006395 saturated elastomer Polymers 0.000 claims description 15
- 238000011282 treatment Methods 0.000 claims description 12
- 239000003814 drug Substances 0.000 claims description 9
- 230000002062 proliferating effect Effects 0.000 claims description 8
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 claims description 7
- 201000010099 disease Diseases 0.000 claims description 6
- 239000008194 pharmaceutical composition Substances 0.000 claims description 6
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 5
- 238000002560 therapeutic procedure Methods 0.000 claims description 4
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- 125000000172 C5-C10 aryl group Chemical group 0.000 claims description 2
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- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 127
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- 125000004159 quinolin-2-yl group Chemical group [H]C1=C([H])C([H])=C2C([H])=C([H])C(*)=NC2=C1[H] 0.000 description 1
- 125000002943 quinolinyl group Chemical group N1=C(C=CC2=CC=CC=C12)* 0.000 description 1
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- 238000004064 recycling Methods 0.000 description 1
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- RAGFPHFDFVNLCG-UHFFFAOYSA-N sibiromycin Natural products OC1C(O)(C)C(NC)C(C)OC1OC(C(=C1O)C)=CC(C2=O)=C1NC(O)C1N2C=C(C=CC)C1 RAGFPHFDFVNLCG-UHFFFAOYSA-N 0.000 description 1
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- 239000011780 sodium chloride Substances 0.000 description 1
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- JVBXVOWTABLYPX-UHFFFAOYSA-L sodium dithionite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])=O JVBXVOWTABLYPX-UHFFFAOYSA-L 0.000 description 1
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- 239000005315 stained glass Substances 0.000 description 1
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- 235000011150 stannous chloride Nutrition 0.000 description 1
- 239000012089 stop solution Substances 0.000 description 1
- 238000007920 subcutaneous administration Methods 0.000 description 1
- 238000010254 subcutaneous injection Methods 0.000 description 1
- 239000007929 subcutaneous injection Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- BUUPQKDIAURBJP-UHFFFAOYSA-N sulfinic acid Chemical compound OS=O BUUPQKDIAURBJP-UHFFFAOYSA-N 0.000 description 1
- 125000001010 sulfinic acid amide group Chemical group 0.000 description 1
- 150000003451 sulfinic acid amides Chemical class 0.000 description 1
- 150000003453 sulfinic acid esters Chemical class 0.000 description 1
- 125000000213 sulfino group Chemical group [H]OS(*)=O 0.000 description 1
- 125000000475 sulfinyl group Chemical group [*:2]S([*:1])=O 0.000 description 1
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- 125000003666 tauryl group Chemical group [H]N([H])C([H])([H])C([H])([H])S(*)(=O)=O 0.000 description 1
- 125000004213 tert-butoxy group Chemical group [H]C([H])([H])C(O*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- ISIJQEHRDSCQIU-UHFFFAOYSA-N tert-butyl 2,7-diazaspiro[4.5]decane-7-carboxylate Chemical compound C1N(C(=O)OC(C)(C)C)CCCC11CNCC1 ISIJQEHRDSCQIU-UHFFFAOYSA-N 0.000 description 1
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- IFLREYGFSNHWGE-UHFFFAOYSA-N tetracene Chemical compound C1=CC=CC2=CC3=CC4=CC=CC=C4C=C3C=C21 IFLREYGFSNHWGE-UHFFFAOYSA-N 0.000 description 1
- KHVCOYGKHDJPBZ-WDCZJNDASA-N tetrahydrooxazine Chemical compound OC[C@H]1ONC[C@@H](O)[C@@H]1O KHVCOYGKHDJPBZ-WDCZJNDASA-N 0.000 description 1
- 125000000383 tetramethylene group Chemical group [H]C([H])([*:1])C([H])([H])C([H])([H])C([H])([H])[*:2] 0.000 description 1
- OSBSFAARYOCBHB-UHFFFAOYSA-N tetrapropylammonium Chemical compound CCC[N+](CCC)(CCC)CCC OSBSFAARYOCBHB-UHFFFAOYSA-N 0.000 description 1
- 150000003536 tetrazoles Chemical class 0.000 description 1
- 230000001225 therapeutic effect Effects 0.000 description 1
- GVIJJXMXTUZIOD-UHFFFAOYSA-N thianthrene Chemical compound C1=CC=C2SC3=CC=CC=C3SC2=C1 GVIJJXMXTUZIOD-UHFFFAOYSA-N 0.000 description 1
- CBDKQYKMCICBOF-UHFFFAOYSA-N thiazoline Chemical compound C1CN=CS1 CBDKQYKMCICBOF-UHFFFAOYSA-N 0.000 description 1
- JWCVYQRPINPYQJ-UHFFFAOYSA-N thiepane Chemical compound C1CCCSCC1 JWCVYQRPINPYQJ-UHFFFAOYSA-N 0.000 description 1
- XSROQCDVUIHRSI-UHFFFAOYSA-N thietane Chemical compound C1CSC1 XSROQCDVUIHRSI-UHFFFAOYSA-N 0.000 description 1
- VOVUARRWDCVURC-UHFFFAOYSA-N thiirane Chemical compound C1CS1 VOVUARRWDCVURC-UHFFFAOYSA-N 0.000 description 1
- 125000001382 thioacetal group Chemical group 0.000 description 1
- 125000005300 thiocarboxy group Chemical group C(=S)(O)* 0.000 description 1
- 150000003566 thiocarboxylic acids Chemical class 0.000 description 1
- 125000000858 thiocyanato group Chemical group *SC#N 0.000 description 1
- 125000005031 thiocyano group Chemical group S(C#N)* 0.000 description 1
- BQAJJINKFRRSFO-UHFFFAOYSA-N thiolane Chemical compound C1CCSC1.C1CCSC1 BQAJJINKFRRSFO-UHFFFAOYSA-N 0.000 description 1
- BRNULMACUQOKMR-UHFFFAOYSA-N thiomorpholine Chemical compound C1CSCCN1 BRNULMACUQOKMR-UHFFFAOYSA-N 0.000 description 1
- 125000005505 thiomorpholino group Chemical group 0.000 description 1
- ARYHTUPFQTUBBG-UHFFFAOYSA-N thiophen-2-ylboronic acid Chemical compound OB(O)C1=CC=CS1 ARYHTUPFQTUBBG-UHFFFAOYSA-N 0.000 description 1
- WEMNATFLVGEPEW-UHFFFAOYSA-N thiophene Chemical compound C=1C=CSC=1.C=1C=CSC=1 WEMNATFLVGEPEW-UHFFFAOYSA-N 0.000 description 1
- 229940113082 thymine Drugs 0.000 description 1
- AXZWODMDQAVCJE-UHFFFAOYSA-L tin(II) chloride (anhydrous) Chemical compound [Cl-].[Cl-].[Sn+2] AXZWODMDQAVCJE-UHFFFAOYSA-L 0.000 description 1
- 125000002088 tosyl group Chemical group [H]C1=C([H])C(=C([H])C([H])=C1C([H])([H])[H])S(*)(=O)=O 0.000 description 1
- 150000003852 triazoles Chemical class 0.000 description 1
- 125000001889 triflyl group Chemical group FC(F)(F)S(*)(=O)=O 0.000 description 1
- 150000004684 trihydrates Chemical class 0.000 description 1
- 229960000281 trometamol Drugs 0.000 description 1
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- 238000003828 vacuum filtration Methods 0.000 description 1
- WKOLLVMJNQIZCI-UHFFFAOYSA-N vanillic acid Chemical compound COC1=CC(C(O)=O)=CC=C1O WKOLLVMJNQIZCI-UHFFFAOYSA-N 0.000 description 1
- TUUBOHWZSQXCSW-UHFFFAOYSA-N vanillic acid Natural products COC1=CC(O)=CC(C(O)=O)=C1 TUUBOHWZSQXCSW-UHFFFAOYSA-N 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
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- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000010626 work up procedure Methods 0.000 description 1
- NLIVDORGVGAOOJ-MAHBNPEESA-M xylene cyanol Chemical compound [Na+].C1=C(C)C(NCC)=CC=C1C(\C=1C(=CC(OS([O-])=O)=CC=1)OS([O-])=O)=C\1C=C(C)\C(=[NH+]/CC)\C=C/1 NLIVDORGVGAOOJ-MAHBNPEESA-M 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
- C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
- C07D487/04—Ortho-condensed systems
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/33—Heterocyclic compounds
- A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
- A61K31/55—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having seven-membered rings, e.g. azelastine, pentylenetetrazole
- A61K31/551—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having seven-membered rings, e.g. azelastine, pentylenetetrazole having two nitrogen atoms, e.g. dilazep
- A61K31/5513—1,4-Benzodiazepines, e.g. diazepam or clozapine
- A61K31/5517—1,4-Benzodiazepines, e.g. diazepam or clozapine condensed with five-membered rings having nitrogen as a ring hetero atom, e.g. imidazobenzodiazepines, triazolam
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D519/00—Heterocyclic compounds containing more than one system of two or more relevant hetero rings condensed among themselves or condensed with a common carbocyclic ring system not provided for in groups C07D453/00 or C07D455/00
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P17/00—Drugs for dermatological disorders
- A61P17/06—Antipsoriatics
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P19/00—Drugs for skeletal disorders
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P19/00—Drugs for skeletal disorders
- A61P19/04—Drugs for skeletal disorders for non-specific disorders of the connective tissue
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P19/00—Drugs for skeletal disorders
- A61P19/08—Drugs for skeletal disorders for bone diseases, e.g. rachitism, Paget's disease
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P35/00—Antineoplastic agents
- A61P35/02—Antineoplastic agents specific for leukemia
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P9/00—Drugs for disorders of the cardiovascular system
- A61P9/10—Drugs for disorders of the cardiovascular system for treating ischaemic or atherosclerotic diseases, e.g. antianginal drugs, coronary vasodilators, drugs for myocardial infarction, retinopathy, cerebrovascula insufficiency, renal arteriosclerosis
Definitions
- the present invention relates to pyrrolobenzodiazepines (PBDs), and in particular pyrrolobenzodiazepine dimers bearing C2 aryl substitutions.
- PBDs pyrrolobenzodiazepines
- pyrrolobenzodiazepine dimers bearing C2 aryl substitutions bearing C2 aryl substitutions.
- PBDs pyrrolobenzodiazepines
- Family members include abbeymycin (Hochlowski, et al., J. Antibiotics, 40, 145- 148 (1987)), chicamycin (Konishi, et al., J. Antibiotics, 37, 200-206 (1984)), DC-81 (Japanese Patent 58-180 487; Thurston, et al., Chem. Brit, 26, 767-772 (1990); Bose, et al., Tetrahedron, 48, 751-758 (1992)), mazethramycin (Kuminoto, et al., J. Antibiotics, 33, 665-667 (1980)), neothramycins A and B (Takeuchi, et al., J.
- cytotoxic compounds having an aryl group at the C2 position for example:
- the present inventors have encountered some issues with the solubility of compounds such as ZC-207, which they have resolved by the use of a different form of these compounds.
- the present invention comprises a compound with the formula I:
- R 2 is an optionally substituted C 5-20 aryl group
- R 6 and R 9 are independently selected from H, R 1 OH, OR, SH, SR, NH 2 , NHR, NRR', nitro, Me 3 Sn and halo
- R and R' are independently selected from optionally substituted Ci-i 2 alkyl, C 3-2O heterocyclyl and C 5-2 O aryl groups
- R 7 is selected from H, R, OH, OR, SH, SR, NH 2 , NHR, NHRR', nitro, Me 3 Sn and halo
- R" is a C 3- - I2 alkylene group, which chain may be interrupted by one or more heteroatoms, e.g. O, S, NH, and/or aromatic rings, e.g. benzene or pyridine;
- X is selected from O, S, or NH;
- z is 2 or 3;
- M is a monovalent pharmaceutically acceptable cation;
- R 2' , R 6' , R 7' , R 9' , X' and M' are selected from the same groups as R 2 , R 6 , R 7 , R 9 , X and M respectively, or M and M' may together represent a divalent pharmaceutically acceptable cation.
- Pyrrolobenzodiazepines having an imine bond are known to convert to the di- carbinolamine form in water, and isolated pyrrolobenzodiazepines often exist as a mixture of the imine, mono-carbinolamine and di-carbinolamine forms. Furthermore, if the compound is isolated as a solid with a mixture of these three forms, the balance between them may change over time. Although this does not pose a problem for administration of the compound, it can provide difficulties in accurately assessing the amount of active substance in a given amount of powder. Compounds of the present invention, at least to some extent, overcome this difficulty whilst remaining activity, and are thus suited to formulation as pharmaceuticals.
- Dimeric pyrrolobenzodiazepines offer advantages over monomeric pyrrolobenzodiazepines in that they possess the ability to cross-link DNA in the minor groove, which can lead to an increase in cytotoxicity.
- substituted refers to a parent group which bears one or more substitutents.
- substitutents refers to a chemical moiety which is covalently attached to, or if appropriate, fused to, a parent group.
- substituents are well known, and methods for their formation and introduction into a variety of parent groups are also well known.
- C 1-12 alkyl refers to a monovalent moiety obtained by removing a hydrogen atom from a carbon atom of a hydrocarbon compound having from 1 to 12 carbon atoms, which may be aliphatic or alicyclic, and which may be saturated or unsaturated (e.g. partially unsaturated, fully unsaturated).
- alkyl includes the sub-classes alkenyl, alkynyl, cycloalkyl, etc., discussed below.
- saturated alkyl groups include, but are not limited to, methyl (C-i), ethyl (C 2 ), propyl (C 3 ), butyl (C 4 ), pentyl (C 5 ), hexyl (C 6 ) and heptyl (C 7 ).
- saturated linear alkyl groups include, but are not limited to, methyl (C 1 ), ethyl (C 2 ), n-propyl (C 3 ), n-butyl (C 4 ), n-pentyl (amyl) (C 5 ), n-hexyl (C 6 ) and n-heptyl (C 7 ).
- saturated branched alkyl groups include iso-propyl (C 3 ), iso-butyl (C 4 ), sec-butyl (C 4 ), tert-butyl (C 4 ), iso-pentyl (C 5 ), and neo-pentyl (C 5 ).
- C 2-12 Alkenyl The term "C 2-12 alkenyl" as used herein, pertains to an alkyl group having one or more carbon-carbon double bonds.
- C 2-12 alkynyl The term "C 2 -1 2 alkynyl" as used herein, pertains to an alkyl group having one or more carbon-carbon triple bonds.
- unsaturated alkynyl groups include, but are not limited to, ethynyl (ethinyl, - C ⁇ CH) and 2-propynyl (propargyl, -CH 2 -CsCH).
- C 3-I2 cycloalkyl refers to an alkyl group which is also a cyclyl group; that is, a monovalent moiety obtained by removing a hydrogen atom from an alicyclic ring atom of a cyclic hydrocarbon (carbocyclic) compound, which moiety has from 3 to 7 carbon atoms, including from 3 to 7 ring atoms.
- cycloalkyl groups include, but are not limited to, those derived from: saturated monocyclic hydrocarbon compounds: cyclopropane (C 3 ), cyclobutane (C 4 ), cyclopentane (C 5 ), cyclohexane (C 6 ), cycloheptane (C 7 ), methylcyclopropane (C 4 ), dimethylcyclopropane (C 5 ), methylcyclobutane (C 5 ), dimethylcyclobutane (C 6 ), methylcyclopentane (C 6 ), dimethylcyclopentane (C 7 ) and methylcyclohexane (C 7 ); unsaturated monocyclic hydrocarbon compounds: cyclopropene (C 3 ), cyclobutene (C 4 ), cyclopentene (C 5 ), cyclohexene (C 6 ), methylcyclopropene (C 4 ), dimethylcyclopropene (C 5 ), methylcycloprop
- C 3-20 heterocyclyl refers to a monovalent moiety obtained by removing a hydrogen atom from a ring atom of a heterocyclic compound, which moiety has from 3 to 20 ring atoms, of which from 1 to 10 are ring heteroatoms.
- each ring has from 3 to 7 ring atoms, of which from 1 to 4 are ring heteroatoms.
- the prefixes e.g. C 3-20 , C 3-7 , C 5-6 , etc.
- the term "Cs- ⁇ heterocyclyl”, as used herein, pertains to a heterocyclyl group having 5 or 6 ring atoms.
- monocyclic heterocyclyl groups include, but are not limited to, those derived from:
- N 1 aziridine (C 3 ), azetidine (C 4 ), pyrrolidine (tetrahydropyrrole) (C 5 ), pyrroline (e.g.,
- O 1 oxirane (C 3 ), oxetane (C 4 ), oxolane (tetrahydrofuran) (C 5 ), oxole (dihydrofuran) (C 5 ), oxane (tetrahydropyran) (C 6 ), dihydropyran (C 6 ), pyran (C 6 ), oxepin (C 7 );
- O 3 trioxane (C 6 ); N 2 : imidazolidine (C 5 ), pyrazolidine (diazolidine) (C 5 ), imidazoline (C 5 ), pyrazoline
- N 1 O 1 tetrahydrooxazole (C 5 ), dihydrooxazole (C 5 ), tetrahydroisoxazole (C 5 ), dihydroisoxazole (C 5 ), morpholine (C 6 ), tetrahydrooxazine (C 6 ), dihydrooxazine (C 6 ), oxazine (C 6 ); N 1 S 1 : thiazoline (C 5 ), thiazolidine (C 5 ), thiomorpholine (C 6 );
- O 1 S 1 oxathiole (C 5 ) and oxathiane (thioxane) (C 6 ); and,
- N 1 O 1 S 1 oxathiazine (C 6 ).
- substituted monocyclic heterocyclyl groups include those derived from saccharides, in cyclic form, for example, furanoses (C 5 ), such as arabinofuranose, lyxofuranose, ribofuranose, and xylofuranse, and pyranoses (C 6 ), such as allopyranose, altropyranose, glucopyranose, mannopyranose, gulopyranose, idopyranose, galactopyranose, and talopyranose.
- furanoses C 5
- arabinofuranose such as arabinofuranose, lyxofuranose, ribofuranose, and xylofuranse
- pyranoses C 6
- allopyranose altropyranose
- glucopyranose glucopyranose
- mannopyranose gulopyranose
- idopyranose galactopyranose
- C 5-2 O aryl refers to a monovalent moiety obtained by removing a hydrogen atom from an aromatic ring atom of an aromatic compound, which moiety has from 3 to 20 ring atoms. Preferably, each ring has from 5 to 7 ring atoms.
- the prefixes e.g. C 3-2 O, C 5-7 , C 5-6 , etc.
- C 5-6 aryl as used herein, pertains to an aryl group having 5 or 6 ring atoms.
- the ring atoms may be all carbon atoms, as in "carboaryl groups".
- carboaryl groups include, but are not limited to, those derived from benzene (i.e. phenyl) (C 6 ), naphthalene (C 10 ), azulene (C 10 ), anthracene (C 14 ), phenanthrene (C 14 ), naphthacene (C 18 ), and pyrene (C 16 ).
- benzene i.e. phenyl
- C 10 naphthalene
- azulene C 10
- anthracene C 14
- phenanthrene C 14
- naphthacene C 18
- pyrene C 16
- aryl groups which comprise fused rings include, but are not limited to, groups derived from indane (e.g. 2,3-dihydro-1 H- indene) (C 9 ), indene (Cg), isoindene (C 9 ), tetraline (1,2,3,4-tetrahydronaphthalene (C 10 ), acenaphthene (C 12 ), fluorene (C 13 ), phenalene (C 13 ), acephenanthrene (C 15 ), and aceanthrene (C 16 ).
- indane e.g. 2,3-dihydro-1 H- indene
- Cg indene
- isoindene C 9
- acenaphthene C 12
- fluorene C 13
- phenalene C 13
- acephenanthrene C 15
- the ring atoms may include one or more heteroatoms, as in "heteroaryl groups".
- heteroaryl groups include, but are not limited to, those derived from:
- N 1 pyrrole (azole) (C 5 ), pyridine (azine) (C 6 ); O 1 : furan (oxole) (C 5 );
- N 1 O 1 oxazole (C 5 ), isoxazole (C 5 ), isoxazine (C 6 );
- N 3 O 1 oxatriazole (C 5 );
- N 1 S 1 thiazole (C 5 ), isothiazole (C 5 );
- N 2 imidazole (1 ,3-di azole) (C 5 ), pyrazole (1 ,2-diazole) (C 5 ), pyridazine (1 ,2-diazine) (C 6 ), pyrimidine (1,3-diazine) (C 6 ) (e.g., cytosine, thymine, uracil), pyrazine (1,4-diazine) (C 6 );
- heteroaryl which comprise fused rings, include, but are not limited to:
- Ci 1 (with 2 fused rings) derived from benzodiazepine (N 2 );
- C 13 (with 3 fused rings) derived from carbazole (N 1 ), dibenzofuran (O 1 ), dibenzothiophene (Si), carboline (N 2 ), perimidine (N 2 ), pyridoindole (N 2 ); and, C 14 (with 3 fused rings) derived from acridine (N 1 ), xanthene (O 1 ), thioxanthene (S 1 ), oxanthrene (O 2 ), phenoxathiin (O 1 S 1 ), phenazine (N 2 ), phenoxazine (N 1 O 1 ), phenothiazine (N 1 S 1 ), thianthrene (S 2 ), phenanthridine (N 1 ), phenanthroline (N 2 ), phenazine (N 2 ).
- Halo -F, -Cl 1 -Br, and -I.
- Ether -OR, wherein R is an ether substituent, for example, a C 1-7 alkyl group (also referred to as a C 1-7 alkoxy group, discussed below), a C 3-20 heterocyclyl group (also referred to as a C 3-20 heterocyclyloxy group), or a C 5-20 aryl group (also referred to as a C 5-20 aryloxy group), preferably a C 1-7 alkyl group.
- R is an ether substituent, for example, a C 1-7 alkyl group (also referred to as a C 1-7 alkoxy group, discussed below), a C 3-20 heterocyclyl group (also referred to as a C 3-20 heterocyclyloxy group), or a C 5-20 aryl group (also referred to as a C 5-20 aryloxy group), preferably a C 1-7 alkyl group.
- Alkoxy -OR, wherein R is an alkyl group, for example, a C 1-7 alkyl group.
- C 1-7 alkoxy groups include, but are not limited to, -OMe (methoxy), -OEt (ethoxy), -O(nPr) (n- propoxy), -O(iPr) (isopropoxy), -O(nBu) (n-butoxy), -O(sBu) (sec-butoxy), -O(iBu) (isobutoxy), and -O(tBu) (tert-butoxy).
- Acetal -CH(0R 1 )(0R 2 ), wherein R 1 and R 2 are independently acetal substituents, for example, a C 1-7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-20 aryl group, preferably a C 1-7 alkyl group, or, in the case of a "cyclic" acetal group, R 1 and R 2 , taken together with the two oxygen atoms to which they are attached, and the carbon atoms to which they are attached, form a heterocyclic ring having from 4 to 8 ring atoms.
- acetal groups include, but are not limited to, -CH(OMe) 2 , -CH(OEt) 2 , and -CH(OMe)(OEt).
- Hemiacetal -CH(OH)(OR 1 ), wherein R 1 is a hemiacetal substituent, for example, a Ci -7 alkyl group, a C3. 20 heterocyclyl group, or a C 5-2O aryl group, preferably a C 1-7 alkyl group.
- R 1 is a hemiacetal substituent, for example, a Ci -7 alkyl group, a C3. 20 heterocyclyl group, or a C 5-2O aryl group, preferably a C 1-7 alkyl group.
- hemiacetal groups include, but are not limited to, -CH(OH)(OMe) and - CH(OH)(OEt).
- Ketal -CR(0R 1 )(0R 2 ), where R 1 and R 2 are as defined for acetals, and R is a ketal substituent other than hydrogen, for example, a C 1-7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-20 aryl group, preferably a Ci -7 alkyl group.
- ketal groups include, but are not limited to, -C(Me)(OMe) 2 , -C(Me)(OEt) 2 , -C(Me)(OMe)(OEt), -C(Et)(OMe) 2 , - C(Et)(OEt) 2 , and -C(Et)(OMe)(OEt).
- R 1 is as defined for hemiacetals, and R is a hemiketal substituent other than hydrogen, for example, a Ci -7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-2O aryl group, preferably a Ci -7 alkyl group.
- hemiacetal groups include, but are not limited to, -C(Me)(OH)(OMe), -C(Et)(OH)(OMe), -C(Me)(OH)(OEt), and -C(Et)(OH)(OEt).
- lmino (imine): NR, wherein R is an imino substituent, for example, hydrogen, C 1-7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-20 aryl group, preferably hydrogen or a C 1-7 alkyl group.
- R is an acyl substituent, for example, a C t-7 alkyl group (also referred to as C 1-7 alkylacyl or Ci -7 alkanoyl), a C 3-20 heterocyclyl group (also referred to as C 3-20 heterocyclylacyl), or a C 5-20 aryl group (also referred to as C 5-2O arylacyl), preferably a C 1-7 alkyl group.
- acyl substituent for example, a C t-7 alkyl group (also referred to as C 1-7 alkylacyl or Ci -7 alkanoyl), a C 3-20 heterocyclyl group (also referred to as C 3-20 heterocyclylacyl), or a C 5-20 aryl group (also referred to as C 5-2O arylacyl), preferably a C 1-7 alkyl group.
- Carboxy (carboxylic acid): -C( O)OH.
- R is an acyloxy substituent, for example, a Ci -7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-20 aryl group, preferably a C 1-7 alkyl group.
- acyloxy groups include, but are not limited to, -OC(O)CH 3 (acetoxy), -OC(O)CH 2 CH 3 , -OC(O)C(CH S ) 3 , -OC(O)Ph, and -OC(O)CH 2 Ph.
- ester groups include, but are not limited to, -OC(O)OCH 3 , -OC(O)OCH 2 CH 3 , -OC(0)OC(CH 3 ) 3 , and -OC(O)OPh.
- R 1 and R 2 are independently amino substituents, for example, hydrogen, a Ci -7 alkyl group (also referred to as Ci -7 alkylamino or di-Ci -7 alkylamino), a C 3-20 heterocyclyl group, or a C 5-20 aryl group, preferably H or a Ci -7 alkyl group, or, in the case of a "cyclic" amino group, R 1 and R 2 , taken together with the nitrogen atom to which they are attached, form a heterocyclic ring having from 4 to 8 ring atoms.
- a Ci -7 alkyl group also referred to as Ci -7 alkylamino or di-Ci -7 alkylamino
- C 3-20 heterocyclyl group or a C 5-20 aryl group, preferably H or a Ci -7 alkyl group
- R 1 and R 2 taken together with the nitrogen atom to which they are attached, form a heterocyclic ring having from 4 to 8 ring atoms.
- Amino groups may be primary (-NH 2 ), secondary (-NHR 1 ), or tertiary (-NHR 1 R 2 ), and in cationic form, may be quaternary (- + NR 1 R 2 R 3 ).
- Examples of amino groups include, but are not limited to, -NH 2 , -NHCH 3 , -NHC(CH 3 ) 2 , -N(CH 3 J 2 , -N(CH 2 CH 3 ) 2 , and -NHPh.
- Examples of cyclic amino groups include, but are not limited to, aziridino, azetidino, pyrrolidino, piperidino, piperazino, morph.olino, and thiomorpholino.
- Amido (carbamoyl, carbamyl, aminocarbonyl, carboxamide): -C( O)NR 1 R 2 , wherein R 1 and R 2 are independently amino substituents, as defined for amino groups.
- Thioamido (thiocarbamyl): -C( S)NR 1 R 2 , wherein R 1 and R 2 are independently amino substituents, as defined for amino groups.
- R 1 is an amide substituent, for example, hydrogen, a C 1-7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-20 aryl group, preferably hydrogen or a C 1-7 alkyl group
- R 1 is an amide substituent, for example, hydrogen, a C 1-7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-20 aryl group,
- R 1 and R 2 may together form a cyclic structure, as in, for example, succinimidyl, maleimidyl, and phthalimidyl:
- R 2 and R 3 are independently amino substituents, as defined for amino groups, and R 1 is a ureido substituent, for example, hydrogen, a C 1-7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-20 aryl group, preferably hydrogen or a C 1-7 alkyl group.
- ureido groups include, but are not limited to, -NHCONH 2 , - NHCONHMe, -NHCONHEt, -NHCONMe 2 , -NHCONEt 2 , -NMeCONH 2 , -NMeCONHMe, -NMeCONHEt, -NMeCONMe 2 , and -NMeCONEt 2 .
- Tetrazolyl a five membered aromatic ring having four nitrogen atoms and one carbon atom
- Imino: NR, wherein R is an imino substituent, for example, for example, hydrogen, a C 1-7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-20 aryl group, preferably H or a C 1-7 alkyl group.
- C 1-7 alkylthio groups include, but are not limited to, -SCH 3 and -SCH 2 CH 3 .
- Disulfide -SS-R, wherein R is a disulfide substituent, for example, a C 1-7 alkyl group, a
- C 3-20 heterocyclyl group or a C 5-20 aryl group, preferably a Ci -7 alkyl group (also referred to herein as C 1-7 alkyl disulfide).
- C 1-7 alkyl disulfide groups include, but are not limited to, -SSCH 3 and -SSCH 2 CH 3 .
- Sulfine (sulfinyl, sulfoxide): -S( O)R, wherein R is a sulfine substituent, for example, a C 1-7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-20 aryl group, preferably a C 1-7 alkyl group.
- R is a sulfine substituent, for example, a C 1-7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-20 aryl group, preferably a C 1-7 alkyl group.
- R is a sulfinate substituent, for example, a C 1-7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-20 aryl group, preferably a C 1-7 alkyl group.
- R is a sulfonate substituent, for example, a C 1-7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-20 aryl group, preferably a C 1-7 alkyl group.
- R is a sulfinyloxy substituent, for example, a C 1-7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-20 aryl group, preferably a C 1-7 alkyl group.
- R is a sulfonyloxy substituent, for example, a C 1-7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-20 aryl group, preferably a C 1-7 alkyl group.
- R is a sulfate substituent, for example, a C 1-7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-20 aryl group, preferably a C 1-7 alkyl group.
- R 1 and R 2 are independently amino substituents, as defined for amino groups.
- R 1 and R 2 are independently amino substituents, as defined for amino groups.
- R 1 is an amino substituent, as defined for amino groups.
- R 1 is an amino substituent, as defined for amino groups
- R is a sulfonamino substituent, for example, a C 1-7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-20 aryl group, preferably a C 1-7 alkyl group.
- R 1 is an amino substituent, as defined for amino groups
- R is a sulfinamino substituent, for example, a C 1-7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-20 aryl group, preferably a C 1-7 alkyl group.
- R is a phosphino substituent, for example, -H, a C 1-7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-20 aryl group, preferably -H, a C 1-7 alkyl group, or a C 5-20 aryl group.
- Examples of phosphino groups include, but are not limited to, -PH 2 , -P(CH 3 ) 2 , -P(CH 2 CHa) 2 , -P(t-Bu) 2 , and -P(Ph) 2 .
- R is a phosphinyl substituent, for example, a C 1-7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-20 aryl group, preferably a C 1-7 alkyl group or a C 5-20 aryl group.
- Phosphorous acid -OP(OH) 2 .
- Phosphite -OP(OR) 2 , where R is a phosphite substituent, for example, -H, a C 1-7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-20 aryl group, preferably -H, a C 1-7 alkyl group, or a C 5-20 aryl group.
- phosphite groups include, but are not limited to, -OP(OCH 3 ) 2 , -OP(OCH 2 CH 3 ) 2 , -OP(O-t-Bu) 2 , and -OP(OPh) 2 .
- Phosphoramidite -OP(OR 1 )-NR 2 2 , where R 1 and R 2 are phosphoramidite substituents, for example, -H, a (optionally substituted) Ci -7 alkyl group, a C 3-20 heterocyclyl group, or a C 5-20 aryl group, preferably -H, a C 1-7 alkyl group, or a C 5-20 aryl group.
- Examples of phosphoramidite groups include, but are not limited to, -OP(OCH 2 CH 3 )-N(CH 3 ) 2 , -OP(OCH 2 CH 3 )-N(i-Pr) 2 , and -OP(OCH 2 CH 2 CN)-N(J-Pr) 2 .
- Examples of bisoxyalkylene groups include, but are not limited to, -0-CH 2 -O-.
- C 3-12 alkylene refers to a bidentate moiety obtained by removing two hydrogen atoms, either both from the same carbon atom, or one from each of two different carbon atoms, of a hydrocarbon compound having from 3 to 12 carbon atoms (unless otherwise specified), which may be aliphatic or alicyclic, and which may be saturated, partially unsaturated, or fully unsaturated.
- alkylene includes the sub-classes alkenylene, alkynylene, cycloalkylene, etc., discussed below.
- linear saturated C 3-12 alkylene groups include, but are not limited to, -(CH 2 ) n - where n is an integer from 3 to 12, for example, -CH 2 CH 2 CH 2 - (propylene), -CH 2 CH 2 CH 2 CH 2 - (butylene), -CH 2 CH 2 CH 2 CH 2 CH 2 - (pentylene) and -CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 - (heptylene).
- branched saturated C 3-12 alkylene groups include, but are not limited to, -CH(CH 3 )CH 2 -, -CH(CH 3 )CH 2 CH 2 -, -CH(CH 3 )CH 2 CH 2 CH 2 -, -CH 2 CH(CH 3 )CH 2 -,
- alicyclic saturated C 3-I2 alkylene groups include, but are not limited to, cyclopentylene (e.g. cyclopent-1 ,3-ylene), and cyclohexylene (e.g. cyclohex-1 ,4-ylene).
- C 3-12 cycloalkylenes examples include, but are not limited to, cyclopentenylene (e.g. 4-cyclopenten-1 ,3-ylene), cyclohexenylene (e.g. 2-cyclohexen-1 ,4-ylene; 3-cyclohexen-1 ,2-ylene; 2,5-cyclohexadien- 1,4-ylene).
- cyclopentenylene e.g. 4-cyclopenten-1 ,3-ylene
- cyclohexenylene e.g. 2-cyclohexen-1 ,4-ylene; 3-cyclohexen-1 ,2-ylene; 2,5-cyclohexadien- 1,4-ylene.
- the pharmaceutically acceptable cation may be inorganic or organic.
- Examples of pharmaceutically acceptable monovalent inorganic cations include, but are not limited to, alkali metal ions such as Na + and K + .
- Examples of pharmaceutically acceptable divalent inorganic cations include, but are not limited to, alkaline earth cations such as Ca 2+ and Mg 2+ .
- Examples of pharmaceutically acceptable organic cations include, but are not limited to, ammonium ion (i.e. NH 4 + ) and substituted ammonium ions (e.g. NH 3 R + , NH 2 FV, NHR 3 + , NR 4 + ).
- Examples of some suitable substituted ammonium ions are those derived from: ethylamine, diethylamine, dicyclohexylamine, triethylamine, butylamine, ethylenediamine, ethanolamine, diethanolamine, piperazine, benzylamine, phenylbenzyiamine, choline, meglumine, and tromethamine, as well as amino acids, such as lysine and arginine.
- An example of a common quaternary ammonium ion is N(CH 3 ) 4 + .
- Proliferative Diseases One of ordinary skill in the art is readily able to determine whether or not a candidate compound treats a proliferative condition for any particular cell type. For example, assays which may conveniently be used to assess the activity offered by a particular compound are described in the examples below.
- proliferative disease pertains to an unwanted or uncontrolled cellular proliferation of excessive or abnormal cells which is undesired, such as, neoplastic or hyperplastic growth, whether in vitro or in vivo.
- proliferative conditions include, but are not limited to, benign, pre-malignant, and malignant cellular proliferation, including but not limited to, neoplasms and tumours
- cancers- e.g. lung cancer, small cell lung cancer, gastrointestinal cancer, bowel cancer, colon cancer, breast carinoma, ovarian carcinoma, prostate cancer, testicular cancer, liver cancer, kidney cancer, bladder cancer, pancreas cancer, brain cancer, sarcoma, osteosarcoma, Kaposi's sarcoma, melanoma), leukemias, psoriasis, bone diseases, fibroproliferative disorders (e.g. of connective tissues), and atherosclerosis.
- cancers- e.g. lung cancer, small cell lung cancer, gastrointestinal cancer, bowel cancer, colon cancer, breast carinoma, ovarian carcinoma, prostate cancer, testicular cancer, liver cancer, kidney cancer, bladder cancer, pancreas cancer, brain cancer, sarcoma, osteosarcoma, Kaposi's sarcoma, melanoma
- leukemias psoriasis
- bone diseases fibroproliferative disorders (e.g.
- Any type of cell may be treated, including but not limited to, lung, gastrointestinal (including, e.g. bowel, colon), breast (mammary), ovarian, prostate, liver (hepatic), kidney (renal), bladder, pancreas, brain, and skin.
- the present invention provide the use of a compound of formula I in a method of therapy.
- a method of treatment comprising administering to a subject in need of treatment a therapeutically-effective amount of a compound of formula I, preferably in the form of a pharmaceutical composition.
- therapeutically effective amount is an amount sufficient to show benefit to a patient. Such benefit may be at least amelioration of at least one symptom.
- the actual amount administered, and rate and time- course of administration, will depend on the nature and severity of what is being treated. Prescription of treatment, e.g. decisions on dosage, is within the responsibility of general practitioners and other medical doctors.
- a compound may be administered alone or in combination with other treatments, either simultaneously or sequentially dependent upon the condition to be treated.
- treatments and therapies include, but are not limited to, chemotherapy (the administration of active agents, including, e.g. drugs; surgery; and radiation therapy.
- compositions according to the present invention may comprise, in addition to the active ingredient, i.e. a compound of formula I, a pharmaceutically acceptable excipient, carrier, buffer, stabiliser or other materials well known to those skilled in the art. Such materials should be non-toxic and should not interfere with the efficacy of the active ingredient.
- a pharmaceutically acceptable excipient e.g. cutaneous, subcutaneous, or intravenous.
- compositions for oral administration may be in tablet, capsule, powder or liquid form.
- a tablet may comprise a solid carrier or an adjuvant.
- Liquid pharmaceutical compositions generally comprise a liquid carrier such as water, petroleum, animal or vegetable oils, mineral oil or synthetic oil. Physiological saline solution, dextrose or other saccharide solution or glycols such as ethylene glycol, propylene glycol or polyethylene glycol may be included.
- a capsule may comprise a solid carrier such a gelatin.
- the active ingredient will be in the form of a parenterally acceptable aqueous solution which is pyrogen-free and has suitable pH, isotonicity and stability.
- a parenterally acceptable aqueous solution which is pyrogen-free and has suitable pH, isotonicity and stability.
- isotonic vehicles such as Sodium Chloride Injection, Ringer's Injection, Lactated Ringer's Injection.
- Preservatives, stabilisers, buffers, antioxidants and/or other additives may be included, as required.
- a reference to carboxylic acid (-COOH) also includes the anionic (carboxylate) form (-COO " ), a salt or solvate thereof, as well as conventional protected forms.
- a reference to an amino group includes the protonated form (-N + HR 1 R 2 ), a salt or solvate of the amino group, for example, a hydrochloride salt, as well as conventional protected forms of an amino group.
- a reference to a hydroxyl group also includes the anionic form (-0 " ), a salt or solvate thereof, as well as conventional protected forms.
- a reference to group (-SO Z M) also includes the anionic form (-SO Z ⁇ ), or solvate thereof, as well as conventional protected forms.
- Certain compounds may exist in one or more particular geometric, optical, enantiomeric, diasteriomeric, epimeric, atropic, stereoisomeric, tautomeric, conformational, or anomeric forms, including but not limited to, cis- and trans-forms; E- and Z-forms; c-, t-, and r- forms; endo- and exo-forms; R-, S-, and meso-forms; D- and L-forms; d- and l-forms; (+) and (-) forms; keto-, enol-, and enolate-forms; syn- and anti-forms; synclinal- and anticlinal-forms; ⁇ - and ⁇ -forms; axial and equatorial forms; boat-, chair-, twist-, envelope-, and halfchair- forms; and combinations thereof, hereinafter collectively referred to as "isomers" (or
- compounds of the present invention have the following stereochemistry at the C11 position:
- isomers are structural (or constitutional) isomers (i.e. isomers which differ in the connections between atoms rather than merely by the position of atoms in space).
- a reference to a methoxy group, -OCH 3 is not to be construed as a reference to its structural isomer, a hydroxymethyl group, -CH 2 OH.
- a reference to ortho-chlorophenyl is not to be construed as a reference to its structural isomer, meta- chlorophenyl.
- a reference to a class of structures may well include structurally isomeric forms falling within that class (e.g. C 1-7 alkyl includes n-propyl and iso-propyl; butyl includes n-, iso-, sec-, and tert-butyl; methoxyphenyl includes ortho-, meta-, and para- methoxyphenyl).
- C 1-7 alkyl includes n-propyl and iso-propyl
- butyl includes n-, iso-, sec-, and tert-butyl
- methoxyphenyl includes ortho-, meta-, and para- methoxyphenyl
- keto/enol (illustrated below), imine/enamine, amide/imino alcohol, amidine/amidine, nitroso/oxime, thioketone/enethiol, N-nitroso/hyroxyazo, and nitro/aci-nitro.
- H may be in any isotopic form, including 1 H, 2 H (D), and 3 H (T); C may be in any isotopic form, including 12 C, 13 C, and 14 C; O may be in any isotopic form, including 16 O and 18 O; and the like.
- a reference to a particular compound includes all such isomeric forms, including (wholly or partially) racemic and other mixtures thereof.
- Methods for the preparation (e.g. asymmetric synthesis) and separation (e.g. fractional crystallisation and chromatographic means) of such isomeric forms are either known in the art or are readily obtained by adapting the methods taught herein, or known methods, in a known manner.
- solvate is used herein in the conventional sense to refer to a complex of solute (e.g. active compound, salt of active compound) and solvent. If the solvent is water, the solvate may be conveniently referred to as a hydrate, for example, a mono-hydrate, a di-hydrate, a tri-hydrate, etc.
- a key step in a preferred route to PBDs is a cyclisation to produce the B-ring, involving generation of an aldehyde (or functional equivalent thereof) at what will be the 11-position, and attack thereon by the Pro-N10- nitrogen:
- R B represents the link (-X-R"-X-) to the other PBD moiety
- R 10 is a nitrogen protecting group
- R 12 is R 2 or a precursor thereof.
- the "masked aldehyde" -CPQ may be an acetal or thioacetal, in which case the cyclisation involves unmasking. Alternatively, it may be an alcohol -CHOH, in which case the reaction involves oxidation, e.g. by means of TPAP, TEMPO or DMSO (Swern oxidation).
- the masked aldehyde compound can be produced by condensing a corresponding 2,4- substituted pyrrolidine with a 2-nitrobenzoic acid:
- the nitro group can then be reduced to -NH 2 and protected by reaction with a suitable agent, e.g. a chloroformate, which provides the removable nitrogen protecting group in the compound of formula IV.
- a suitable agent e.g. a chloroformate
- TPAP tetrapropylammonium perruthenate
- NMO N-methylmorpholine N-oxide
- a particularly preferred oxidising agent is (diacetoxyiodo)benzene (1.1 eq) and TEMPO (0.1 eq) dissolved in CH 2 CI 2 .
- the uncyclized alcohol (B) may be prepared by the reaction of a nitrogen protection reagent of formula D, which is preferably a chloroformate or acid chloride, to a solution of the amino alcohol C, generally in solution, generally in the presence of a base such as pyridine (preferably 2 equivalents) at a moderate temperature (e.g. at 0 ⁇ C). Under these conditions little or no O-acylation is usually observed.
- the key amino alcohol C may be prepared by reduction of the corresponding nitro compound E, by choosing a method which will leave the rest of the molecule intact. Treatment of E with tin (II) chloride in a suitable solvent, e.g. refluxing methanol, generally affords, after the removal of the tin salts, the desired product in high yield.
- Exposure of E to hydrazine/Raney nickel avoids the production of tin salts and may result in a higher yield of C, although this method is less compatible with the range of possible C and A-ring substituents. For instance, if there is C-ring unsaturation (either in the ring itself, or in R 2 or R 3 ), this technique may be unsuitable.
- Another suitable means of reduction would be catalytic hydrogenation using palladium on carbon as a catalyst.
- the nitro compound of formula E may be prepared by coupling the appropriate o- nitrobenzoyl chloride to a compound of formula F, e.g. in the presence of K 2 CO 3 at -25 " C under a N 2 atmosphere.
- Compounds of formula F can be readily prepared, for example by olefination of the ketone derived from L-trans-hydroxy proline.
- the ketone intermediate can also be exploited by conversion to the enol triflate for use in palladium mediated coupling reactions.
- the o-nitrobenzoyl chloride is synthesised from the o-nitrobenzoic acid (or alkyl ester after hydrolysis) of formula G, which itself is prepared from the vanillic acid (or alkyl ester) derivative H.
- formula G which itself is prepared from the vanillic acid (or alkyl ester) derivative H.
- the thioacetal compound may be prepared as shown in scheme 2: the thioacetal protected C-ring [prepared via a literature method: Langley, D.R. & Thurston, D.E., J.
- PBD dinners may be synthesized using the strategy developed for the synthesis of the protected PBD monomers.
- the synthesis routes illustrated in scheme 3 show compounds when the dimer linkage is of the formula -O-(CH 2 ) n -O-, and may be readily modified for other dimer linkages.
- the step of dimer formation is normally carried out to form a bis(nitro acid) G'. This compound can then be treated as compound G in either scheme 1 or scheme 2 above.
- the bis(nitro acid) G' may be obtained by nitrating (e.g. using 70% nitric acid) the bis(carboxylic acid). This can be synthesised by alkylation of two equivalents of the relevant benzoic acid with the appropriate diiodoalkane under basic conditions. Many benzoic acids are commercially available and others can be synthesised by conventional methods. Alternatively, the relevant benzoic acid esters can be joined together by a Mitsunobu etherification with an appropriate alkanediol, followed by nitration, and then hydrolysis (not illustrated).
- An alternative synthesis of the bis(nitro acid) involves oxidation of the bis(nitro aldehyde), e.g. with potassium permanganate. This can be obtained in turn by direct nitration of the bis(aldehyde), e.g. with 70% HNO 3 . Finally, the bis(aldehyde) can be obtained via the Mitsunobu etherification of two equivalents of the benzoic aldehyde with the appropriate alkanediol.
- the C2 aryl substituent may be in place in compounds of formula IV, by starting with the appropriate material, in which case the N10 may be deprotected to yield the desired compound (see below).
- the following method can be used where R12 is a protected hydroxy group.
- the C11 -alcohol IV is then preferably re-protected, by conventional means to provide IHb.
- R 11 is TBS
- the protection can take place by reacting IV with TBSOTf and 2,6-lutidine.
- Cleavage of the C2-protecting group from IHb then provides the C2 alcohol.
- the C2 protecting group (R 14 ) is acyl
- this deprotection may be performed by addition of an aqueous solution of K 2 CO 3 .
- This reprotection at the C11 position and deprotection of the C2 alcohol allows subsequent reaction of selectively the C2 alcohol position leaving the C11 position unaffected.
- the C2-alcohol may then be oxidized to the ketone IHb.
- this oxidation is performed under Swem conditions, in good yield.
- other oxidation methods involving TPAP or the Dess Martin reagent also provide the ketone in good yield.
- R" 12 is trfilate that reaction with trifluoromethanesulfonic anhydride in DCM in the presence of pyridine.
- R in the compound of formula Il may also be -I or -Br, in which case the conversion from IHb may be achieved by reaction with hydrazine and iodine or bromine respectively.
- R in the compound of formula Il may also be -Cl, where the conversion from IHb may be achieved by reaction with a phosphorous oxychloride (e.g. POCI 3 ).
- a phosphorous oxychloride e.g. POCI 3
- This compound of formula H may be reacted under a variety of conditions to yield PBD precursor molecules with pendant groups coupled at the C2 position Ic.
- the palladium catalyst may be any suitable catalyst, for example Pd(PPh 3 ) 4 , Pd(OCOCH 3 ) 2 , PdCI 2 , Pd(dba) 3 .
- the compounds which are coupled may be any suitable reactant, e.g. for Heck, alkenes with an sp 2 H; for Stille, organostannanes; and for Suzuki, organoboron derivatives.
- the coupling may be performed under microwave conditions.
- the palladium catalyst such as Pd(PPh 3 ) 4
- the palladium catalyst is solid supported, for example on polystyrene, to facilitate work-up and allow potential recycling of catalyst.
- Unreacted boronic acid can be sequestered following complete consumption of triflate using PS-DEAM, with a phase separator cartridge being used to isolate the coupling product.
- phase separator cartridge is used to isolate the coupling product.
- the imine bond in the compound of formula Ic can be unprotected by standard methods to yield the unprotected compound Ib (which may be in its carbinolamine or carboinolamine ether form , depending on the solvents used).
- the deprotection is carried using palladium to remove the N10 protecting group, followed by the elimination of water.
- R 10 is Troc, then the deprotection is carried out using a Cd/Pb couple to yield the compound of formula Ib.
- X is O.
- R" represents a linear saturated C 3-12 alkylene group, and more preferably an alkylene group having 3, 5, 7, 8, 9, 10, 11 or 12 carbon atoms. Of these C 3 and C 5 linear saturated alkylene groups are preferred.
- R 9 is preferably H.
- R 6 is preferably selected from H, OH, OR, SH, NH 2 , nitro and halo, and is more preferably H or halo, and most preferably is H.
- R 7 is preferably selected from H, OH, OR, SH, SR, NH 2 , NHR, NRR', and halo, and more preferably independently selected from H, OH and OR, where R is preferably selected from optionally substituted C 1-7 alkyl, C3- 1 0 heterocyclyl and C 5-10 aryl groups. Particularly preferred substituents at the 7- position are OMe and OCH 2 Ph.
- R 2 is preferably an optionally substituted C 5-7 aryl group, and most preferably an optionally substituted phenyl group.
- R 2 is a C 9-12 aryl group, for example napthy-1-yl or napth-2-yl.
- C 9-12 aryl groups include quinolinyl, for example, quinolin-2-yl, quinolin- 3-yl and quinolin-6-yl.
- R 2 is a C 5-7 heteroaryl group, for example furanyl, thiophenyl and pyridyl. Of these thiophenyl is preferred, for example, thiophen-2-yl and thiophen-3-yl.
- the C 5-20 aryl group may bear any substituent group. It preferably bears from 1 to 3 substituent groups, with 1 and 2 being more preferred, and singly substituted groups being most preferred.
- C 5-20 aryl substituents particularly for phenyl, include: halo (e.g. F, Cl, Br); C 1-7 alkoxy (e.g. methoxy, ethoxy); C 1-7 alkyl (e.g. methyl, trifluoromethyl, ethyl, propyl, t-butyl); bis-oxy-alkylene (e.g. bis-oxy-methylene, -0-CH 2 -O-).
- halo e.g. F, Cl, Br
- C 1-7 alkoxy e.g. methoxy, ethoxy
- C 1-7 alkyl e.g. methyl, trifluoromethyl, ethyl, propyl, t-butyl
- bis-oxy-alkylene e.g. bis-oxy-methylene, -0-CH 2 -O-
- Particularly preferred substituted C 5-20 aryl groups include, but are not limited to, 4-methyl- phenyl, 4-methoxy-phenyl, 3-methoxyphenyl, 4-fluoro-phenyl, 3,4-bisoxymethylene-phenyl, 4-triflouoromethylphenyl, 4-methylthiophenyl, 4-cyanophenyl and 4-phenoxyphenyl.
- Particularly preferred unsubstituted C 5-20 aryl groups include, but are not limited to thiophen-2-yl, napth-2-yl, quinolin-3-yl and quinolin-6-yl.
- R is optionally substituted C 1-12 alkyl, it is preferred that it is optionally substituted C 1-7 alkyl.
- both PBD monomers are identically substituted. It is preferred that M and M' are monovalent pharmaceutically acceptable cations, and are more preferably Na + .
- z is preferably 3.
- Preferred compounds include:
- More preferred compounds include:
- a most preferred compound is:
- the above preferred compounds may also have a C 5 alkylene linking chain.
- Compound 1 is formed in high yield in a four step process known in the art starting from frans-4-hydroxy-L-proline (SJ. Gregson et al., J. Med. Chem., 2004, 1161-1174).
- reaction mixture was washed with saturated NH 4 CI (2 x 150 mL), saturated CuSO 4 (150 mL), H 2 O (150 mL), brine (150 mL) and dried (MgSO 4 ).
- TEMPO (0.69 g, 4.42 mmol, 0.4 eq) and BAIB (15.7 g, 48.7 mmol, 4.4 eq) were added to a stirred solution of diol 8 (11.5 g, 11.1 mmol) in DCM (150 mL).
- the reaction mixture was allowed to stir for 2 h and diluted with DCM (400 mL), washed with saturated NaHSO 3 (500 mL), saturated NaHCO 3 (500 mL), brine (200 mL) and dried (MgSO 4 ).
- TBSOTf (2.70 mL, 3.10 g, 11.7 mmol, 3.0 eq) was added to a stirred solution of bis-alcohol 9 (4.05 g, 3.91 mmol) and 2,6-lutidine (1.82 mL, 1.68 g, 15.6 mmol, 4.0 eq) in DCM (50 mL).
- the reaction mixture was allowed to stir for 2.5 h and diluted with DCM (150 mL), washed with saturated CuSO 4 (2 X 100 mL), saturated NaHCO 3 (100 mL), brine (200 mL) and dried (MgSO 4 ).
- Glacial acetic acid (90 mL) was added to a stirred solution of 38 (5.06 g, 3.91 mmol) in H 2 O (30 mL) and THF (30 mL). The reaction mixture was allowed to stir at room temperature for 16 h at which point TLC (95:5 v/v CHCI 3 /MeOH) revealed completion of the reaction. The acidic solution was added dropwise to a stirred solution of NaHCO 3 (132 g) in H 2 O (1.3 L) at 0 0 C (ice/acetone).
- TEMPO (234 mg, 1.50 mmol) and BAIB (5.31 g, 16.5 mmol) were added to a stirred solution of bis-alcohol 39 (4.0 g, 3.75 mmol) in DCM (140 mL).
- the reaction mixture was allowed to stir under a nitrogen atmosphere for 24 hours at which point TLC (95:5 v/v CHCI 3 /MeOH) revealed conversion of starting material to product.
- the mixture was diluted with DCM (30 mL), washed with saturated aqueous NaHSO 3 (2 x 30 ml_), saturated aqueous NaHCO 3 (2 x 30 mL), brine (30 mL) and dried (MgSO 4 ).
- TBSOTf (1.27 mL, 1.47 g, 5.54 mmol) was added to a stirred solution of bis-alcohol 40 (1.96 g, 1.85 mmol) and 2,6-lutidine (0.86 mL, 0.79 g, 7.39 mmol) in dry DCM (40 mL).
- the reaction mixture was allowed to stir under a N 2 atmosphere for 5 hours after which time TLC (EtOAc) revealed consumption of starting material. Following dilution with DCM (50 mL), the organic mixture was washed with saturated CuSO 4 (30 mL), saturated NaHCO 3 (30 mL), brine (50 mL) and dried (MgSO 4 ).
- Pd(PPh 3 ) 4 (7.43 mg, 6.43 ⁇ mol) was added to a solution of the triflate 44 (236 mg, 0.16 mmol), 4-methoxyphenylboronic acid (63 mg, 0.42 mmol), TEA (0.13 mL, 98 mg, 0.97 mmol) in H 2 O (0.8 mL), EtOH (5 mL) and toluene (5 mL) at room temperature.
- the reaction mixture was heated in the microwave at 100 0 C for 30 minutes after which time TLC (80:20 v/v EtOAc/hexane) revealed the complete consumption of the starting material.
- K562 human chronic myeloid leukaemia cells were maintained in RPM1 1640 medium supplemented with 10% fetal calf serum and 2 mM glutamine at 37°C in a humidified atmosphere containing 5% CO 2 and were incubated with a specified dose of drug for 1 hour at 37°C in the dark. The incubation was terminated by centrifugation (5 min, 300 g) and the cells were washed once with drug-free medium. Following the appropriate drug treatment, the cells were transferred to 96-well microtiter plates (10 4 cells per well, 8 wells per sample). Plates were then kept in the dark at 37°C in a humidified atmosphere containing 5% CO 2 .
- the assay is based on the ability of viable cells to reduce a yellow soluble tetrazolium salt, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide (MTT, Aldrich-Sigma), to an insoluble purple formazan precipitate.
- MTT yellow soluble tetrazolium salt
- 20 ⁇ l_ of MTT solution 5 mg/mL in phosphate-buffered saline
- the plates were then centrifuged for 5 min at 300 g and the bulk of the medium pipetted from the cell pellet leaving 10-20 ⁇ l_ per well.
- DMSO 200 ⁇ l_
- the optical density was then read at a wavelength of 550 nm on a Titertek Multiscan ELISA plate reader, and a dose-response curve was constructed. For each curve, an IC 50 value was read as the dose required to reduce the final optical density to 50% of the control value.
- the compounds to be tested were dissolved in 100% Biotech grade DMSO (Sigma) and subsequently diluted to stock concentrations of either 2 ⁇ M or 200 nM in 2% DMSO. 100 ⁇ l of the stock concentrations were serially diluted 1 in 3 in 2% DMSO in intermediate polystyrene 96 well cell culture plates (Nunc). 2% DMSO was placed in the outer columns for use as blanks, and in the 2 nd or 11 th column (depending on whether the top or bottom of an assay plate was to be used) for use as a control.
- the entire row of the intermediate plate was then transferred in triplicate to either rows B to D or E to G of a fluorescence compatible polystyrene 96 well cell culture plate (Greiner BioOne); 10 ⁇ l to each well.
- a cell solution containing 5 x 10 4 cells/ml was made up in phenol red free RPMI 1640 (Sigma) supplemented with 10% foetal calf serum (Sigma) and 2OmM L-glutamine (Sigma).
- 190 ⁇ l cell solution was added to each well of the assay plate, from columns 2 to 11.
- 190 ⁇ l culture media was added to columns 1 and 12. Plates were incubated for 96 hours at 37°C in 5% CO 2 .
- LOXIMVI and OVCAR-5 cell lines A cell solution containing 5 x 10 4 cells/ml of either LOXIMVI human melanoma cells or
- OVCAR-5 human ovarian tumour cells was made up in phenol red free RPMI 1640 (Sigma) supplemented with 10% foetal calf serum (Sigma) and 2OmM L-glutamine (Sigma). 190 ⁇ l cell solution was added to each well of a fluorescence compatible polystyrene 96 well cell culture plate (Greiner BioOne), from columns 2 to 11. 190 ⁇ l culture media was added to columns 1 and 12. Plates were incubated overnight at 37°C in 5% CO 2 . Compounds were dissolved in 100% Biotech grade DMSO (Sigma) and subsequently diluted to stock concentrations in 2% DMSO.
- Example 10 Anti tumour activity The following experiments was carried out under a project licence approved by the Home Office, London, UK, and UK CCCR guidelines (Workman, P., et at., British Journal of Cancer, 77, 1-10 (1998)) were followed throughout.
- LOX IMVI human melanomas
- nude mice B&K Universal, Hull, UK
- Tumours were transplanted as single tumour fragments in the flank by trocar.
- Groups of 8 tumour-bearing mice were treated with ZC423 at the previously established single intravenous (iv) maximum tolerated dose (MTD) of ⁇ mgkg '" ' using 5% DMA/saline as the vehicle.
- tumours could be reliably measured by calipers (mean dimensions 4 x 4mm) and therapeutic effects were assessed by daily caliper measurements of the tumour and mouse weights.
- Tumour volumes were determined by the formula a ⁇ x b/2 where a is the smaller and b is the larger diameter of the tumour.
- the results are shown in Fig. 1 as a graphs of relative tumour volume against time ( ⁇ ZC423; ⁇ Control - solvent alone).
- the activity of ZC423 was shown to be statistically significant when assessed by Mann-Whitney analysis (as described, for example, in Essential Statistics 2 nd Edition (1989), D.G.Rees, ISBN 0 412 32030 4, Chapman and Hall, London).
- Fig. 2 shows the results of the same test (• ZC423; ⁇ Control - solvent alone) but extended over a longer period, and with a larger scale for the Mean RTV.
- the control group was ceased at 16 days, at which point there were no tumour free mice, compared to the treated group where all animals were tumour free at 68 days.
- Electrophoresis was performed on a 0.8% submerged horizontal agarose gel, 20 cm in length for 16 hours at 38-40 V in 1 x TAE running buffer (2.42 g Tris Base, 0.372 g EDTA, 0.571ml glacial acetic acid). Gels were dried under vacuum for 80 minutes at 80 0 C on a Savant SG21 OD SpeedGel gel dryer onto one layer of Whatman 3MM with a layer of DE81 filter paper underneath. An autoradiograph was obtained, after overnight exposure onto FujiRX x-ray film. The film bands were quantitated using a BioRad GS-670 imaging laser densitometer.
- the percentage of cross-linking was calculated by measuring the total DNA in each lane (the sum of the densities for the double-stranded and single-stranded bands) relative to the amount of density of double-stranded band alone.
- a dose response curve was derived by plotting drug concentration against the determined percentage level of cross-linked DNA, from which was derived the amount required to cross-link 50% of the DNA (XL 50 ).
- Solubility was determined by dissolving the test compound in the minimum amount of water to produce a saturated solution.
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CA2604805A1 (en) | 2006-10-26 |
AU2006238686A1 (en) | 2006-10-26 |
DK1879901T3 (en) | 2010-05-03 |
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EP1879901A1 (en) | 2008-01-23 |
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BRPI0610284A8 (en) | 2017-05-09 |
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US20100113425A1 (en) | 2010-05-06 |
AU2006238686B2 (en) | 2011-10-06 |
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JP5061096B2 (en) | 2012-10-31 |
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CY1109911T1 (en) | 2014-09-10 |
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US8633185B2 (en) | 2014-01-21 |
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